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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764e48e376c5376a669e37d002d1258e55850019de4acb712b675a66bfe75086' 
  AND token = 'esrEJLLkvOmHLTh4TSQMVVtDvHuJJeOw85x9t3lgImI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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