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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d69afc85572f67fb549bc80e19d8b33d5c6354b3b88755d5224622f4f55c12' 
  AND token = 'L5wKVJJzmiH156Iir/Fk+WVeSkv/5T5iJhEpKiceVGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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