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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96e9fa1fbd68e8dd14ee4b0534963dcbe9e67618f6307ec136a08b3beff6e92' 
  AND token = 'n+9uo6EjP20yhgTQk46a9PbLsi36BJBXEWoaDoImH+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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