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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2514640f7e35f38e5a5bc6785d8d44afbb20fb6fed6e7abbd43307e83befc41' 
  AND token = '9UgM+TKBaP5lhsx1Z6iMWeTrZ7lIKYIOCfPI/kwEsHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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