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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e37a1bf5e4d246d900bf8c3296874b5bee6b41ad4ab453bee0bb9f76c14aa92' 
  AND token = 'bDbmOm98sysW8u0azO+bXkrlulcAmwGkUrs8U9Cu4t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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