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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fe5b99d15ff960edc73e90b5844c96cee1c5823f45021f87fcca92fefe438c' 
  AND token = 'a45WXkHWUF0x7ROsHc0jwBQ7e4AWfFZlwgtjH6sw2lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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