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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec19a0b039059338c875af190fd53c9c1a2511572b070f641bd49788d4ea9b7' 
  AND token = 'Tlwwy9e6KMjofjB9bk/mtS9xIz2MsYSq3bYKHzq33pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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