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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3270aff6817fefa4027c017ce3c66113e0006de787f2ff6311ff01a1a06549c1' 
  AND token = 'osvBbggc5aA1AXe0AKkATq2Nu0mCNCI6JiY1DE+slZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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