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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a0450bde036560ddc1012bd7c8f027ae5bbbd02e9cbfa88baa80c366a52d2f' 
  AND token = 'jXfJnKh7xPRJdaB59zf4vLOOC5ST1dFs0TOH79h1fh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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