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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb04357436365d6cfae9c79d563a32c48fda516174a99ffb816af98cff29959' 
  AND token = 'iSF3eL2l2+f8Kr5qXUXhk4A/Ai3fSiLoQ6uOuAhMcWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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