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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ae2e4a5b54c310faed06de4fae41f1ee7f9946cb936a2d848a2539d4b37c10' 
  AND token = 'siQY/Rk4UprUNGAQHVSrp2CMEigMCikUS9t9cPRD54c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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