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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d992589f7758d3761e26b7782b0ee065d805612becfddbad9b263555e15ac4' 
  AND token = 'XBcj2Mk87nGhsAD5ukJuswKH4Y/bjvTsoUstWETgj7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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