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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde80a3e70c0203bfe52a78d392629f59e87abad858c75cce8d0fea4367bab8e' 
  AND token = 'nOdQN6InjdCOwEB2mY14GJLObI+ZgcM768Yo5WXgYsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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