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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f488a539ef2ab37d1b337e7ab3df500d1b5a9a897fadd9f454f26cade0ab62' 
  AND token = 'm/9HvCUiZ27uTdFqWCckxlxM63ZEar2o7Z4kIE+ZPjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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