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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33bf137172086ddc7d5ad61495fcf40ee214717bd0d02df464ccb7f5e688f207' 
  AND token = 'b5/M2XerMPdLiX1ZIn9L1hOlDfa0fjPD8ttyCIH0raY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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