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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077d12a51a0b095ee6b07f501bc63e291f07af839e9e11df552f5330527485f0' 
  AND token = 'hkh0cRqlrtALar1TofP4m0BEjhP7M2nxHsdJZVLD+p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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