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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcef215993e84131eb0e91448a38a774a770b2271fe1acbe40c0e2b5a09266d' 
  AND token = 'BKnB64fiX04w10JB63tH5UOiHVTkbYYEX4q8SWIBfhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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