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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84bcb7b05b4ded72a810e1044f15b9e2a7a65eb761c520ea211b8d987efeb27' 
  AND token = 'W/oYge+5eWxWN7G2HlUtbs06LdjhNz6OtcH0x5ZHo/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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