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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa6c3102292b6f95e5db5a1971e46cffd7b223c946434adca524c085d9404d1' 
  AND token = '3ylrrpl22nV5CKR5nZj37LCBuzM2HN3dO6sLC7QEmOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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