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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5976fc58dc3bc8f1f4ae8c96e5a71d80ba339d56b9e31862d09260f492d6fb2e' 
  AND token = 'YAXreNjY0cRCslO7/ngmZCgtlSL1JxpEfHC+oKRgR2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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