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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48c1eca9c8d9e5b4d4591c18f6a425608d2f8aa0f2a4b63f1109291f4434af3' 
  AND token = 't51yzfWIssPyruePhttspKSyrAX5ey8OAwzu1jH1/C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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