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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e45f32c94745bfd8ac72ab9a473820aa779d8c9974be86171b2360db68db216' 
  AND token = 'xohK7D47Z3eq6Z65+OmC2PpOvs4hQF2j97vooEAKEGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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