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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af32d7c9c7ac29be1d7de598b490319d859642ce95402a290207551405c3ea4f' 
  AND token = 'NzsV88Kn2y79np0e5+AeE1lbqI0V0259dQol/wPyAN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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