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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f561ea55cc792e92eecf918cc3660132858f32102cc999693d8ca783b409c061' 
  AND token = 'elfFRmGIQiJK121vkG5tmjvx+w/fTBwuB0RefLq/PRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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