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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fb1d5fd988fa65ff90376c5e499fdc9c46544e8c5587b69fa778373e42625c' 
  AND token = 'fNLs0HCrf2kSXYZw/lQWoLdVsCC623f7/3nPBZFKRUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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