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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdc86edb2d28e944eba401aa57958bffad20ae9e282d9ddd95b50264f2b8c32' 
  AND token = 'P44wV2RwSX81ctsOosT3gVODElrH6EKRapoczw/aPVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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