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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2652d72962ba1ac3084d5e3d8d4af6198c4f5d702c85618fbdb8e2b96e954796' 
  AND token = 'rHmJrLVuoWbUbHryQTuyP2pXW9flZpAWKnNZ06FBI90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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