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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216eb5e422900db804f2b2f900d56315065ed0f08b901410a4a3968686d06ac4' 
  AND token = '4GcUAnUikfeZ8KGDaFZaTgeZAih7PqkkjK4c/ZRsj+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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