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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e2245c5fb8046fc770d78f7a134da41c82fa44c7d7137ac5ec298b52c2e9b2' 
  AND token = 'OQRc+t4JVgG33tYg4rGDGHIpAR7gro+bSUkFiwcGCvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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