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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368d24a6f7f39a9bd62753af7a69d2e42eed4511f119856977cf6f87ec776f77' 
  AND token = '62yglBGF0+rEcLbb1TlMHxH25mMWbeFWQ3N1xOrOeOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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