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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17816ed3db622f90196b56f521be7c08a47bd636be11388f170956d8833de247' 
  AND token = '+wOuCvOmT7Vw0+jrxou8SM1pP3lJeJX3oFk25YYu8zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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