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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887276f3bd7de28af9d187a7fac945692fb383d76e941e6c03370500198e6bcb' 
  AND token = 'YdYNaQIeV653/nJEjptTBEeIWyw6jjdc2DbDRxKSfA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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