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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b19023a8caac857388ab1997f4ae7d88934ea407e9280f4d32cf005d7fc5f7' 
  AND token = 'O3nn6HN/Io81a8yM5eb2j/q1eradYI22Pw/fx5pP848=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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