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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ea34a118e32f152c9dc1519f18b4957a7a95e0fbca78f205b506d734011a8a' 
  AND token = 'w0subKsdIz/RKUiU4BNyCSCJapqMELH6Mqd7svK4Ygo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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