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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d83e287e93b102e6443fb036db6d57d259ac657c0cb591cea1c2635fc09066e' 
  AND token = 'mGDLlJ6egods5p6KLy15tLQwPzk5GwvWpPu4/0gFv3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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