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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a10beab2a22d7240b8b4bd18158b324a3d8caa1f1d0815860aa5c17cd54969' 
  AND token = 'v0bJq2YAWvoEELih7PncPvS0xT65/K/Lm7pj8vtDBy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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