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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347d06fad3a1e7871b5aba779f94e0aacbc9afa040092d1c2a7b757446262615' 
  AND token = 'Fh2s4zh56hJwZ0T2d5R9LZvGWcCJQ+80jDSih10uecA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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