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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fc1584f92f6a5976fdd8a86e42c5c4ae08a773d697c49ef2de9796f4a0df10' 
  AND token = 'znaxh2jqjzztko7fgtiOkMWyemomPeINGS9QPhQqkoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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