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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fddd0470206cfff786fa049c4c59f0694f179aff2b1c01f6d9f9851a8ab1d0' 
  AND token = 'HH8BynCcF9pC9cm3QDM9fgbyDeIF/oJOdS5g3DSDHzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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