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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c9b4cdf3af6d144ba580ae4359223f1906d572fcdd9bc2eb2bf91587d6ae1d' 
  AND token = 'Sw5ANQGGSJ/slPRgrBYP1cH8sKEfLvNfu0i8KkR4i2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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