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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b704a9af73919db4801c43331eb52c33208807b3b0b36def0d2f030b478fb57a' 
  AND token = 'GJc7ZBfEJMWmlALfZrNiR4uenWtQ5Vt2oMM3PLmGn/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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