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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e6bcbe01d321de10d5f4742e4b2cf9c4156a111d85fbfd732c2cf912d9ba66' 
  AND token = 'bJ/elPJKVqB+MHtnsMCBUw+br0ULrpez2c34drH9UKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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