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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bb830b5c22985cbf59953088c4c563ae4609b6758f222f599bbe5bfa9e2124' 
  AND token = 'RCJtizbmk9SuYlKYoTWxb26KM3xEFqY8IOak5E3gMjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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