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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fdf2c3d33435cbd4f0f0f644ddd08129850393e9dd4f3dee67751a1d1775ab' 
  AND token = '63Fj3laIjVu4W33d4EWv6NYNnbeq9jjcxy89xpw+HiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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