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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ced0047ece62e905409909d410ff416955ca3fc816beb4c73bdf20fba894aa' 
  AND token = '/jBU/PkofYPF4ITr08Rct7gJ8FU6v1Mw01Pf4gf1rJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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