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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cde325b4f8a5a2a447b54c8ae25ad7e22bebb82cfd77aa5a88065eade1ed1b' 
  AND token = 'A3UT5i1qInKlP6UwyBc7ni8e0MEADZl/SVS59/4y5JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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