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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2693874d1a97fa23e6274b606be8c269bfbcf7350fccdbb242e8672e414ab69e' 
  AND token = 'KCAg92F+OUD4Y+x3J+oTHewpmusJpXe9TzCWvo8zFrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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