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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334ee00c944bff5b244ac6a1bf12eb189e4380ef5d654bf6be139cdd0b9e90e6' 
  AND token = '0Lzi0PoYKZZB86vZNrl7X9caZcBDYLDhxVWRS5VcMEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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