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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf0027e30ab7f772a620717db32dcaa4a4322c40ebe0c60452cca1bdfb3bfcc' 
  AND token = '/SMgYai98Ukyh2A352y+8njJP0nvyz/p5k1AGNq36ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}