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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de5a19318327c115c177bf5bf476377ab5fe859c9d280baa5aa14dc0e177993' 
  AND token = 'g7nQiCsIO7F15+mbwRJPqOLfIHnsX7gslGYmcPnGnLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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