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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa5d5ff76f2aa7225c649f5427393309dee7059e9e7bc455fdda583833893a9' 
  AND token = 'Qf83IISXYpfTmnHZqtMsWXEXcXgXBXRZlyXvjMo0hLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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