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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9154dad09263de8fbabf159524c289fd567d1581bc87e86f4d82e31f2d6343fd' 
  AND token = 'b1NMwJRk+jV2SdXuBVK6g2/jfrnF2X/0EQHBbP3NBgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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