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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9406139d4ec5fa0bc3ac8c5beb8d3ba5fb081c03b2804e73cb5bb538b55442' 
  AND token = '2LMajTwvzyGqXxC1RT3ZIF9rsZgBV0zFZ+KXdXalt2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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