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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878991f079403e93bfbe912830ce512037c010abd2a958503f41122dbc5cead5' 
  AND token = 'zMvB80uKVBLR/BZCH1a5cehriHb5vWNPoeVjJRH2TXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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