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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc69a64e5014e1d7a1dce110d4de9b11692be9b34f7e528b534e40cad8a8bbbf' 
  AND token = 'FiXXP58egNhaP4zylMIUAZ/tW7XwTordnvGnIjcyG6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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